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Old 01-19-2015, 04:22 PM   #1
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Possibly over heating motor isc 330

New to me ISC 330 Cummins motor running unload. The motor temp running 190 to 210 outsided temp in the 60 has a horton clutch fan. Coach has 52000 miles .Is this a normal motor temperture .Coming home from Sanit Louis cooling fan was kicking in an out.

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Old 01-19-2015, 04:53 PM   #2
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It sounds like you are reporting running temps, not idling, right?

On mine, I've never seen it higher than 180 when underway. I had my cooling system flushed at the recommended interval. It might just need a little TLC.

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Old 01-19-2015, 05:12 PM   #3
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I've got a Cummins 8.3 ISC 350 hp, it normally runs at 180 unless I'm pulling a long hill with high temps outside, but only climbs to ~190 for short periods of time.

What Model coach do you have, if it is a rear radiator it may be getting hot due to restricted flow. Rear radiators are notorious for getting dirty.
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Old 01-19-2015, 05:34 PM   #4
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temps don't sound out of line thermostat is around 190 so your engine should heat up to that quickly . remember water boils at 212 BUT pressure caps on Radiators increase boiling point 3 degrees per each 1 lb rating your cap is at least 7 lbs so the boiling point = 233 degrees Check your system learn whats is right for you temp wise. check air flow plugging etc
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Old 01-19-2015, 06:49 PM   #5
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Sounds normal to me, 2008 ISC. Mine swings back and
forth from 185 to 212 constantly while under load.
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Old 01-19-2015, 06:53 PM   #6
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I have a personal max temp of 205 and that's not conservative.
The fan should be running flat out over 200 not cycling.
There is an issue with your cooling system.
Need to get to the bottom of it.
Your engine will run for ever if kept within limits.
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Old 01-19-2015, 06:57 PM   #7
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If you have a fan clutch then you must have a rear radiator. Has the stack been cleaned? If not that will probably clear it up as it is running too hot. Our ISC 350 normally runs at 180į on the flats and only ran higher when the radiator needed cleaning for the first time in 11 years (side radiator stack).
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Old 01-20-2015, 06:33 PM   #8
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Thanks for the help talk to Cummings today its a 2007 monaco knight rear radiator 190 thermostat dash gauge reading high but.Still going to clean the air to air an radiator this week end.

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